The Characteristics at the Ali Observatory Based on Radiosonde Observations

doi:10.1088/1538-3873/aae6e2

CORC > 国家天文台 > 中国科学院国家天文台

	The Characteristics at the Ali Observatory Based on Radiosonde Observations
	Qian, Xuan 1,2; Yao, Yongqiang 2; Wang, Hongshuai 2; Wang, Yiping 2; Bai, Zhen 3; Yin, Jia 2
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
	2018-12-01
卷号	130 期号:994 页码:14
关键词	site testing methods: data analysis atmospheric effects balloons Online material: color figures
ISSN号	0004-6280
DOI	10.1088/1538-3873/aae6e2
英文摘要	As part of the conceptual and preliminary design process of the Chinese Large Telescope, we have spent the last several years measuring and statistically analyzing the atmospheric characteristics above the high Ali Observatory region, in the most western part of the Tibetan Plateau. This is the first article in a series discussing the Ali Observatory site-testing campaign, and we analyze the radiosonde data sets for the first time in that area. The profiles of precipitable water vapor (PWV), upper wind, and optical turbulence are depicted, in addition the statistical characteristics are obtained. PWV profiles in the Ali area indicate that PWV is mainly concentrated below the altitude of 12 km above mean sea level(msl), decreasing with altitude, and has seasonal variations affected by monsoons. In 2016, the median PWV at the Ali Observatory was about 2.0 mm, and less than 1.0 mm during the winter. The wind profiles show strong seasonal variations of wind speed in the troposphere, where there is a prevailing stable west wind. The median wind speed at the height of the 200hP alpha pressure level was 27 m/s in 2016, with a mean speed over 50 m/s in February and 10 m/s in August. The optical turbulence profiles also show seasonal variations, with C-n(2) values between 10(-17) m(-2/3) and 10(-18) m(-2/3) in the free atmosphere. Three turbulent layers are found at the heights around 6-8 km, 12-13 km, and 18-20 km above msl, respectively. In 2016, the median seeing was estimated to be 0.'' 35 at the Ali Observatory, and 0.'' 24 in the summer. The results suggest that very low water vapor in winter, weak upper wind, and good seeing conditions in summer are present at the Ali Observatory, yielding high infrared transparency and high sensitivity for future ground-based optical and infrared telescopes. Given the unique longitude and high altitude, the Ali Observatory might be a promising site in the northern hemisphere for astronomical observations.
资助项目	Chinese Academy of Sciences[XDB23020300] ; National Natural Science Foundation of China (NSFC)[U1738203] ; National Natural Science Foundation of China (NSFC)[11203044] ; National Natural Science Foundation of China (NSFC)[11473041] ; National Natural Science Foundation of China (NSFC)[11653005]
WOS关键词	HIGH-ALTITUDE WIND ; PRECIPITABLE WATER-VAPOR ; STATISTICS ; RADIOMETER ; FORECAST ; VELOCITY ; C-N(2) ; HANLE ; MODEL
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000450241000001
资助机构	Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/23333]
专题	中国科学院国家天文台
通讯作者	Qian, Xuan
作者单位	1.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ China, 20A Datun Rd, Beijing, Peoples R China 3.Ali Meteorol Bur, 9 Cent Beijing Rd, Shiquanhe Town, Tibet, Peoples R China
推荐引用方式 GB/T 7714	Qian, Xuan,Yao, Yongqiang,Wang, Hongshuai,et al. The Characteristics at the Ali Observatory Based on Radiosonde Observations[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2018,130(994):14.
APA	Qian, Xuan,Yao, Yongqiang,Wang, Hongshuai,Wang, Yiping,Bai, Zhen,&Yin, Jia.(2018).The Characteristics at the Ali Observatory Based on Radiosonde Observations.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,130(994),14.
MLA	Qian, Xuan,et al."The Characteristics at the Ali Observatory Based on Radiosonde Observations".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 130.994(2018):14.